单项选择题

1.5米处日最高温度出现在（）。

A．12-13时
B．13-14时
C．14-15时
D．15-16时

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判断题

This is an argument: Biscuits can be bad for your teeth. We often eat mid-morning when the effects of breakfast have worn off. Biscuit companies, like other food manufacturers, require their employees to wear hats to hold back their hair for health and safety reasons.

单项选择题

二阶方程组的奇点为 . ( )

A．对
B．错

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